Nonstandard mixing in the standard map

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dc.creatorBaldovin, Fulvio
dc.creatorTsallis, Constantino
dc.creatorSchulze, Bruno
dc.date2001-08-29
dc.date2001-09-19
dc.date.accessioned2026-07-07T02:42:34Z
dc.date.available2026-07-07T02:42:34Z
dc.descriptionThe standard map is a paradigmatic one-parameter (noted $a$) two-dimensional conservative map which displays both chaotic and regular regions. This map becomes integrable for $a=0$. For $a \ne 0$ it can be numerically shown that the usual, Boltzmann-Gibbs entropy $S_1(t)=-\sum_{i} p_i(t)\ln{p_i(t)}$ exhibits a {\it linear} time evolution whose slope hopefully converges, for very fine graining, to the Kolmogorov-Sinai entropy. However, for increasingly small values of $a$, an increasingly large time interval emerges, {\it before} that stage, for which {\it linearity} with $t$ is obtained only for the generalized nonextensive entropic form $S_q(t)=\frac{1-\sum_{i}[p_i(t)]^{q}}{q-1}$ with $q = q^*\simeq 0.3$. This anomalous regime corresponds in some sense to a power-law (instead of exponential) mixing. This scenario might explain why in isolated classical long-range $N$-body Hamiltonians, and depending on the initial conditions, a metastable state (whose duration diverges with $1/N\to 0$) is observed before it crosses over to the BG regime.
dc.descriptionlatex, 11 pages, 5 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0108501
dc.identifierhttp://arxiv.org/abs/cond-mat/0108501
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/18195
dc.subjectStatistical Mechanics
dc.titleNonstandard mixing in the standard map
dc.typetext

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